1.\" 2.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3.\" 4.\" Copyright (c) 2020 Andriy Gapon <avg@FreeBSD.org> 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.\" $FreeBSD$ 28.\" 29.Dd November 6, 2021 30.Dt MAX44009 4 31.Os 32.Sh NAME 33.Nm max44009 34.Nd driver for MAX44009 Ambient Light Sensor 35.Sh SYNOPSIS 36To compile this driver into the kernel, 37place the following lines in your 38kernel configuration file: 39.Bd -ragged -offset indent 40.Cd "device max44009" 41.Cd "device iicbus" 42.Ed 43.Pp 44Alternatively, to load the driver as a 45module at boot time, place the following line in 46.Xr loader.conf 5 : 47.Bd -literal -offset indent 48max44009_load="YES" 49.Ed 50.Sh DESCRIPTION 51The 52.Nm 53driver reports illuminance data from MAX44009 Ambient Light Sensor. 54.Pp 55The 56.Nm 57driver reports data via 58.Xr sysctl 8 59entry in the device's node in the 60.Xr sysctl 8 61tree: 62.Bl -tag -width illuminance 63.It Va illuminance 64The illuminance, in lux units. 65.El 66.Pp 67On an 68.Xr FDT 4 69based system the following properties must be set: 70.Bl -tag -width "compatible" 71.It Va compatible 72Must be set to 73.Qq maxim,max44009 . 74.It Va reg 75The I2C address of 76.Nm 77which can be either 0x4a or 0x4b. 78.El 79.Sh SEE ALSO 80.Xr fdt 4 , 81.Xr iicbus 4 , 82.Xr sysctl 8 83.Sh HISTORY 84The 85.Nm 86driver and this manual page was written by 87.An Andriy Gapon Aq Mt avg@FreeBSD.org . 88.Sh BUGS 89The 90.Nm 91driver does not support illuminance thresholds and the corresponding 92interrupt. 93